Helium Acoustic Microscopy

A. F.G. Wyatt

doi:10.1117/12.934328

29 March 1983 Helium Acoustic Microscopy

A. F.G. Wyatt

Proceedings Volume 0368, Microscopy: Techniques and Capabilities; (1983) https://doi.org/10.1117/12.934328
Event: Microscopy-Techniques and Capabilities, 1982, London, United Kingdom

Abstract

Acoustic microscopy using liquid ⁴He offers the possibility of considerably higher resolution than microscopes at room temperature which use water as the coupling medium. At the same frequency the wavelength of sound in liquid helium is a sixth of that in water and because there is no attenuation in liquid ⁴He there is the possibility of using much higher frequencies than is presently used (3 GHz) with water. The properties of liquid ⁴He rele-vant to this application are reviewed together with the equipment necessary to work at 0.1K. The information likely to be obtained from helium microscopy is considered and compared to room temperature acoustic microscopy. Although helium acoustic microscopy is still in its infancy recent results indicate that it is likely to be a valuable new tool.

Citation Download Citation

A. F.G. Wyatt "Helium Acoustic Microscopy", Proc. SPIE 0368, Microscopy: Techniques and Capabilities, (29 March 1983); https://doi.org/10.1117/12.934328

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